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irqchip / GIC: Convert the GIC driver to ACPI probing 

Now that we have a basic infrastructure to register irqchips and
call them on discovery of a matching entry in MADT, convert the
GIC driver to this new probing method.

It ends up being a code deletion party, which is a rather good thing.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Marc Zyngier 2015-09-28 15:49:14 +01:00 committed by Rafael J. Wysocki
parent 46e589a391
commit f26527b142
6 changed files with 37 additions and 98 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/include/asm/acpi.h
View File

@ -12,7 +12,6 @@
#ifndef _ASM_ACPI_H
#define _ASM_ACPI_H
#include <linux/irqchip/arm-gic-acpi.h>
#include <linux/mm.h>
#include <linux/psci.h>

2
arch/arm64/include/asm/irq.h
View File

@ -1,8 +1,6 @@
#ifndef __ASM_IRQ_H
#define __ASM_IRQ_H
#include <linux/irqchip/arm-gic-acpi.h>
#include <asm-generic/irq.h>
struct pt_regs;

25
arch/arm64/kernel/acpi.c
View File

@ -205,28 +205,3 @@ void __init acpi_boot_table_init(void)
disable_acpi();
}
}
void __init acpi_gic_init(void)
{
struct acpi_table_header *table;
acpi_status status;
acpi_size tbl_size;
int err;
if (acpi_disabled)
return;
status = acpi_get_table_with_size(ACPI_SIG_MADT, 0, &table, &tbl_size);
if (ACPI_FAILURE(status)) {
const char *msg = acpi_format_exception(status);
pr_err("Failed to get MADT table, %s\n", msg);
return;
}
err = gic_v2_acpi_init(table);
if (err)
pr_err("Failed to initialize GIC IRQ controller");
early_acpi_os_unmap_memory((char *)table, tbl_size);
}

71
drivers/irqchip/irq-gic.c
View File

@ -41,7 +41,6 @@
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/irqchip/arm-gic-acpi.h>
#include <asm/cputype.h>
#include <asm/irq.h>
@ -1195,7 +1194,7 @@ IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
#endif
#ifdef CONFIG_ACPI
static phys_addr_t dist_phy_base, cpu_phy_base __initdata;
static phys_addr_t cpu_phy_base __initdata;
static int __init
gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
@ -1223,60 +1222,56 @@ gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
return 0;
}
static int __init
gic_acpi_parse_madt_distributor(struct acpi_subtable_header *header,
/* The things you have to do to just *count* something... */
static int __init acpi_dummy_func(struct acpi_subtable_header *header,
const unsigned long end)
{
struct acpi_madt_generic_distributor *dist;
dist = (struct acpi_madt_generic_distributor *)header;
if (BAD_MADT_ENTRY(dist, end))
return -EINVAL;
dist_phy_base = dist->base_address;
return 0;
}
int __init
gic_v2_acpi_init(struct acpi_table_header *table)
static bool __init acpi_gic_redist_is_present(void)
{
return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
acpi_dummy_func, 0) > 0;
}
static bool __init gic_validate_dist(struct acpi_subtable_header *header,
struct acpi_probe_entry *ape)
{
struct acpi_madt_generic_distributor *dist;
dist = (struct acpi_madt_generic_distributor *)header;
return (dist->version == ape->driver_data &&
(dist->version != ACPI_MADT_GIC_VERSION_NONE ||
!acpi_gic_redist_is_present()));
}
#define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
#define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
const unsigned long end)
{
struct acpi_madt_generic_distributor *dist;
void __iomem *cpu_base, *dist_base;
int count;
/* Collect CPU base addresses */
count = acpi_parse_entries(ACPI_SIG_MADT,
sizeof(struct acpi_table_madt),
gic_acpi_parse_madt_cpu, table,
ACPI_MADT_TYPE_GENERIC_INTERRUPT, 0);
count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
gic_acpi_parse_madt_cpu, 0);
if (count <= 0) {
pr_err("No valid GICC entries exist\n");
return -EINVAL;
}
/*
* Find distributor base address. We expect one distributor entry since
* ACPI 5.1 spec neither support multi-GIC instances nor GIC cascade.
*/
count = acpi_parse_entries(ACPI_SIG_MADT,
sizeof(struct acpi_table_madt),
gic_acpi_parse_madt_distributor, table,
ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 0);
if (count <= 0) {
pr_err("No valid GICD entries exist\n");
return -EINVAL;
} else if (count > 1) {
pr_err("More than one GICD entry detected\n");
return -EINVAL;
}
cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
if (!cpu_base) {
pr_err("Unable to map GICC registers\n");
return -ENOMEM;
}
dist_base = ioremap(dist_phy_base, ACPI_GICV2_DIST_MEM_SIZE);
dist = (struct acpi_madt_generic_distributor *)header;
dist_base = ioremap(dist->base_address, ACPI_GICV2_DIST_MEM_SIZE);
if (!dist_base) {
pr_err("Unable to map GICD registers\n");
iounmap(cpu_base);
@ -1302,4 +1297,10 @@ gic_v2_acpi_init(struct acpi_table_header *table)
acpi_irq_model = ACPI_IRQ_MODEL_GIC;
return 0;
}
IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
gic_v2_acpi_init);
IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,
gic_v2_acpi_init);
#endif

3
drivers/irqchip/irqchip.c
View File

@ -27,8 +27,5 @@ extern struct of_device_id __irqchip_of_table[];
void __init irqchip_init(void)
{
of_irq_init(__irqchip_of_table);
#if defined(CONFIG_ARM64) && defined(CONFIG_ACPI)
acpi_gic_init(); /* Temporary hack */
#endif
acpi_probe_device_table(irqchip);
}

31
include/linux/irqchip/arm-gic-acpi.h
View File

@ -1,31 +0,0 @@
/*
* Copyright (C) 2014, Linaro Ltd.
* Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef ARM_GIC_ACPI_H_
#define ARM_GIC_ACPI_H_
#ifdef CONFIG_ACPI
/*
* Hard code here, we can not get memory size from MADT (but FDT does),
* Actually no need to do that, because this size can be inferred
* from GIC spec.
*/
#define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
#define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
struct acpi_table_header;
int gic_v2_acpi_init(struct acpi_table_header *table);
void acpi_gic_init(void);
#else
static inline void acpi_gic_init(void) { }
#endif
#endif /* ARM_GIC_ACPI_H_ */